A general 1 to 3 inches of rain can fall along the coast by the end of the weekend, with locally higher amounts possible.

New York City will likely exceed its normal rainfall for all of May by the middle of the month. So far, the city has received 3.21 inches of its normal monthly rainfall of 4.19 inches.

“Flooding from the heavy rain should be limited primarily to urban areas,” Adamson said. Small streams and low-lying areas could also experience an increase in water levels.

The heaviest rain will arrive overnight Friday into Saturday morning and exit by Saturday night in Richmond, Virginia; Washington, D.C.; Baltimore; and Philadelphia.

Heavy rain will overtake eastern Pennsylvania, New Jersey, New York City and Long Island on Saturday, before shifting northeastward to Boston and Portland, Maine, on Saturday night.

A second wave of blustery showers will drop southward from Canada on the back edge of the storm into the mid-Atlantic and New York on Mother’s Day. It will take until later Monday before the dreary conditions fully exit New England.

Should enough chilly air be manufactured by the storm, it is not out of the question for wet snowflakes to mix with the rain over the higher elevations of New York and New England during the second half of the weekend.

Gusty winds strengthening first along the coast and then across interior areas will render umbrellas useless at times. A rain jacket with a hood may be more helpful to stay dry when venturing outdoors.

The winds could be strong enough to cause tree and power line damage and sporadic power outages.

Water from the Atlantic will be pushed toward the upper mid-Atlantic and New England coasts due to the winds. The greatest threat for coastal flooding at times of high tide and beach erosion will be from the Delmarva Peninsula to Maine.

“At this time, any coastal flooding looks to be minor since the storm will not be extremely strong and the full moon occurred this past Wednesday,” Adamson said.

In a few days after the storm departs, some of the warmest air so far this month is expected to surge into the Northeast later in the week.